Zhifeng Bao

A Query Optimizer for Range Queries over Multi-Attribute Trajectories

Jianqiu Xu, Hua Lu, Zhifeng Bao

Journal article  |  2023  |  ACM Transactions on Intelligent Systems and Technology

A multi-attribute trajectory consists of a spatio-temporal trajectory and a set of descriptive attributes. Such data enrich the re..

A Framework to Support Continuous Range Queries Over Multi-Attribute Trajectories

Jianqiu Xu, Zhifeng Bao, Hua Lu

Journal article  |  2023  |  IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING

Emerging applications over spatio-temporal trajectories require representing the data from diverse aspects. We study multi-attribu..

How Context or Knowledge Can Benefit Healthcare Question Answering?

Xiaoli Wang, Feng Luo, Qingfeng Wu, Zhifeng Bao

Journal article  |  2023  |  IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING

Healthcare question answering (HQA) is a challenging task as questions are generally non-factoid in nature. Traditional informatio..

Route Travel Time Estimation on A Road Network Revisited: Heterogeneity, Proximity, Periodicity and Dynamicity

H Yuan, G Li, Z Bao

Journal article  |  2022  |  Proceedings of the VLDB Endowment

In this paper, we revisit the problem of route travel time estimation on a road network and aim to boost its accuracy by capturing..

Differentially Private Triangle Counting in Large Graphs

X Ding, S Sheng, H Zhou, X Zhang, Z Bao, P Zhou, H Jin

Journal article  |  2022  |  IEEE Transactions on Knowledge and Data Engineering

Triangle count is a critical parameter in mining relationships among people in social networks. However, directly publishing the f..

Towards an Optimal Bus Frequency Scheduling: When the Waiting Time Matters

Songsong Mo, Zhifeng Bao, Baihua Zheng, Zhiyong Peng

Journal article  |  2022  |  IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING

Reorganizing bus frequencies to cater for the actual travel demands can significantly save the cost of the public transport system..

Representative Routes Discovery from Massive Trajectories

T Wang, S Huang, Z Bao, JS Culpepper, R Arablouei

Conference Proceedings  |  2022  |  Proceedings of the ACM SIGKDD International Conference on Knowledge Discovery and Data Mining

In this work, we study how to find the k most representative routes over large scale trajectory data, which is a fundamental opera..

Equitable Public Bus Network Optimization for Social Good: A Case Study of Singapore

D Tedjopurnomo, Z Bao, F Choudhury, H Luo, AK Qin

Conference Proceedings  |  2022  |  ACM International Conference Proceeding Series

Public bus transport is a major backbone of many cities' socioeconomic activities. As such, the topic of public bus network optimi..

Approximate Range Thresholding

Z Zhang, J Gan, Z Bao, SMH Kazemi, G Chen, F Zhu

Conference Proceedings  |  2022  |  Proceedings of the ACM SIGMOD International Conference on Management of Data

In this paper, we study the (approximate) Range Thresholding (RT) problem over streams. Each stream element is a d-dimensional poi..

Deep entity matching with adversarial active learning

Jiacheng Huang, Wei Hu, Zhifeng Bao, Qijin Chen, Yuzhong Qu

Journal article  |  2022  |  VLDB JOURNAL

Entity matching (EM), as a fundamental task in data cleansing and integration, aims to identify the data records in databases that..